The ECHO 43320038138, also known as P021008680, is a genuine OEM chain brake assembly designed for ECHO CS-370 and CS-400 chainsaws. This critical safety component is engineered to rapidly halt the chainsaw chain in the event of kickback, significantly reducing the risk of injury to the operator. Constructed from durable plastic and metal components, this authentic replacement part ensures reliable performance and maintains the original safety standards of your ECHO chainsaw.